Grinding or polishing roller



Feb. 6, 1923. LMLM.' A I A 0. G. HERDER.

GRINDING 0R POLISHING ROLLER. FILED ocr. 2o, 1921.

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Patented Feb. t5, i923.

UNTED STATES CHARLES G. HERDER, OF LOUSVILLE, KENTUCKY.

GRNDING OR POLISHING ROLLER.

Application iiled October 20, 1921.

i o all whom it may concern.'

Be it known that l, CHARLES G. Hannan, a citizen of the United States.residingat Louisville, in the county of Jefferson and State of Kentucky,have invented certain new and useful Improvements in Grinding orPolishing Rollers; and l do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to improvements in grinding and polishing rollersand more particularly to those in which the sheet of abrasive orpolishing material is backed up by a pneumatic cushion instead of theusual padding.

ln carrying` out my invention, I provide ra pair of axially alined headsaround which the ends of an inflated tube are secured and one object ofmy invention is to mount said heads so that they may move outwardly apredetermined distance when the tube is inflated. By having the headsnormally rather close together, the tube may be secured thereto muchmore easily than could otherwise be accomplished, and furthermore, it isadvantageous to have the heads move outwardly when the tube is filledwith air, so as to draw the sheet of polishing or grinding` material tothe desired degree of tightness.

A further object of the invention is to provide means for holding thetwo heads against any other relative movement after they have movedoutwardly under air pressure to a pre-determined extent.

A still further object is to make novel provision for renewing thegrinding or polishing sheet without disturbing the air cushion.

lVith the foregoing in view, the invention resides in the novel subjectmatter hereinafter described and claimed, the descriptive matter beingsupplemented by the accompanying drawings:

Figure 1 is a longitudinal sectional view, partly in elevation, showingmy invention before the sheet of abrasive or polishing materialisattached and the device inflated.

Figure 2 is a view similar to Fig. 1 but illustrating the tube inflated,the heads separated and the abrasiveor polishing sheet secured andstretched in place.

Figures 3, 4 and 5 are transverse sectional views as indicated by thelines 3-3, 4 4 and 5-5 of Fig. 2.

Serial No. 599,161.

In the drawings above briefly described, the numerals 1 and 1a designatea pair of circular heads which are positioned in axial alinement, and ashere shown, are provided with inner and outer shaft sections 2 and 2"*respectively, said shaft sections being splined or keyed together asindicated at 2:5, that while they may relatively slide to permit inwardor outward movement of the heads 1 and 1a, no relative rotation of saidheads and shaft sections is permitted. rlhe outer ends of the heads 1and 1L are provided with stubs e; and 11a, one of which is provided witha smooth extension 5 for connection in any suitable manner with thearbor of a grinding or polishing machine. yllhe stub ein may well beprovided with an extension 5 to travel in a supplemental bearing toprevent possible whipping of the device. lll/lith the heads 1 and 1amoved inwardly to the positions shown in Fig. 1, a rubber air tube G isapplied thereto as shown in Fig. 1, the ends of the tube being`positioned around the heads and turned inwardly at 7 upon the outersides thereof, said inwardly turned ends being secured in place by meansof clamping collars 8 which are secured to the heads by screws or thelike 9. The heads 1 and 1a are preferably tapered to some eX- tent asshown and provided with external ribs 1() at their larger ends, and theclamping collars are preferably formed with ila-red flanges 11surrounding the tapered portions of the heads and engaging the endportions of the tube. rl'his construction serves to more readily clampthe tube ends against the heads in a fluid tight manner.

lll/hilo any desired means may be provided for inflating the tube 6, Iprefer to form a port 12 through the head 1a, its stub d and extension5, the outer end of said port being equipped with an appropriate checkvalve 13 to which a pump or air line may be connected. llVhen the tubeis inflated, the air pressure forces the heads 1 and 1a to moveoutwardly away from each other as will be seen by comparing Figs. 1 and2, and to lock the shaft sections 2 and 2a of said heads together, whenthis outward movement has taken place, I provide a. spring-carriedlocking pin 14k on the outer shaft section receivable in a socket 15 inthe inner section. The outward movement of the heads 1 and 1a isadvantageous to draw the sheet of grinding or polishing material 16 tautand furthermore, it is much easier llO to insert the heads l and 1"' inthe ends o' the tube 6 and secure said ends to said heads, before anystretchingv ol the tube is produced, since otherwise the ends of saidtube would tend to withdraw from the heads l efore they could be tightlyclamped in place.

The grinding or polishing sheet lll is formed into a tube whose ends areslit and turned inwardly upon the outer iaces ol" the collars or ringsS, said ends being; clamped in position by clamping rings l? "threadedon the stubs land da. rlhese r are preterably provided with sockets le'to permit the use of a Spanner l'or tinninY them. By

preference, the rings li" are not tig to the maximum entent until aft-Grthe tube 6 is inflated and the heads and l have moved outwardly,substantia y to the end of their travel. The rings l? are then tightlythreaded in place to hold the ends of the sheet 1G against slippage, sothat the complete inllation or the tube (5 and n aximum outward movementolf the heads l and lZL will tightly stretch the sheet lll, so as toproduce the most advantageous results. lVhile this sheet preferablyextends straight between the heads as seen in Fig'. 2, it will beunderstood that by inl'lating the tube G to a greater extent, said tubeand sheet may be outwardly bowed if this is desirable lor any particularclass oit work. ln all cases, the grinding or polishing sheet is backedup by an air cushion which gives much better results than the usualpadding.

Since excellent results may be obtained with the construction andarrangement herein shown and described, this is taken as the preferredembodiment of the invention. However, l wish it to be understood thatminor changes coming` within the scope of the invention as claimed maybe resorted to if desired.

l claim:

l. A device of the class described coinprising a pair of axially alinedheads relatively movable away from each other .iu the direction oi theiraxis, an elastic tube hav ing its ends secured around said heads inLatas 1a an air tight manner, means for securing a sheet of grinding orpolishing` material to said heads around said tube, and means wherebysaid tube may be inflated and said heads thereby forced outwardly awayfrom each other'.

2. A device ol' the dass described comprising a pair of axially alinedheads relatively movable away trom each other in the direction of theiraxis, an elastic tube having its ends secured around said heads in anair tight manner, means for securing' a sheet ol grinding' or polishing'material to said heads around said tube, means whereby said tube may beinflated and said heads `thereby forced outwardly away from each other,and means :tor holdinkcV said heads in the relative positions to whichthey are forced.

3. A device of the class described comprisino' pair of heads axiallyalined with each other and provided with telescoping shaft sections, aninflatable tube having' its ends secured around said heads, inflation ofsaid tube serving' to force said heads outwardly away from each other,and co-aeting latch means on said shaft sections for holding themagainst relative lmovement when said heads have moved outwardly to apredetermined extent.

4. A device oi the class described comprising a pair of circular headsmounted in axial alinement and having' central outwardly extendingstubs, an inflatable tube having its ends positioned around said headsand turned inwardly upon the outer sides thereoi, clamping' ringssurrounding' said stubs and secured to said heads to clamp the tube inplace, a sheet of abrasive or polishing' material around said tube hay'in c; its ends turned inwardly against the outer sides of saidclamping rings, and other clamping rings threaded on said stubs to clampthe ends of said sheet against said lirst named rings. Y

ln testimony whereof l have hereunto set my hand.

CHARLES G. l'llllllll.

